Claude Fable 5.1 vs GPT-6 Astra
Claude Fable 5.1 comes out ahead on 11 of 14 shared measures, and the two rank 3 and 7 of 51 overall. Both cost A$28.08 per million tokens (blended).
Where each one wins.
Claude Fable 5.1 ranks 3rd of 51; GPT-6 Astra ranks 7th.
Claude Fable 5.1 ranks 1st of 42; GPT-6 Astra ranks 2nd.
Claude Fable 5.1 ranks 1st of 41; GPT-6 Astra ranks 2nd.
Claude Fable 5.1 ranks 2nd of 51; GPT-6 Astra ranks 3rd.
Claude Fable 5.1 ranks 4th of 51; GPT-6 Astra ranks 23rd.
Claude Fable 5.1 ranks 20th of 50; GPT-6 Astra ranks 23rd.
Both cost A$28.08 per million tokens (blended).
Claude Fable 5.1 writes 1.2× faster (65 tok/s vs 54 tok/s).
Both can be used from Australia through their makers’ own APIs (Anthropic and OpenAI), which may process requests outside Australia. Claude Fable 5.1 can be called from AWS Bedrock in Sydney and Melbourne and Google Vertex AI in Sydney, but only through global routing, so requests may be processed outside Australia. GPT-6 Astra can be called from AWS Bedrock in Sydney and Microsoft Azure in Australia East, but only through global routing, so requests may be processed outside Australia.
Side by side.
“Level” means the gap is inside LMArena’s confidence interval, or the scores are identical. Independent test scores are for each model’s headline setting. Both models can be used from Australia through their makers’ APIs; the Australian rows show whether requests can also be processed in Australia.
| BENCHMARK | CLAUDE FABLE 5.1 | GPT-6 ASTRA | LEADS |
|---|---|---|---|
| AA Intelligence Index | 53.4 | 52.7 | Claude Fable 5.1 |
| AA Coding Index | 81.6 | 76.9 | Claude Fable 5.1 |
| GPQA Diamond | 93.7% | 96.1% | GPT-6 Astra |
| Humanity’s Last Exam | 59.1% | 54.7% | Claude Fable 5.1 |
| AA-LCR | 85.3% | 80.7% | Claude Fable 5.1 |
| Terminal-Bench 2.1 | 91.4% | 88.4% | Claude Fable 5.1 |
| τ²-Bench (banking) | 47.2% | 41.4% | Claude Fable 5.1 |
| SciCode | 63.1% | 56.5% | Claude Fable 5.1 |
| LMArena Text | 1499 | 1480 | Level |
| LMArena WebDev | 1755 | 1793 | GPT-6 Astra |
| LMArena Vision | 1289 | 1284 | Level |
| LMArena Document | 1493 | 1473 | Level |
| LMArena Agent | #1 | #2 | Claude Fable 5.1 |
| Blended price (AUD) | A$28.08 | A$28.08 | Level |
| Output speed | 65 tok/s | 54 tok/s | Claude Fable 5.1 |
| Answer starts after | 2.0 min | 3.4 min | Claude Fable 5.1 |
| Context window | 1,000,000 tokens | 1,050,000 tokens | GPT-6 Astra |
| USE FROM AUSTRALIA | |||
| Maker’s API | YES | YES | |
| Processed in Australia | NO | NO | |
| AUSTRALIAN CLOUD REGIONS | |||
| AWS Bedrock · Sydney | GLOBAL | GLOBAL | |
| AWS Bedrock · Melbourne | GLOBAL | NOT IN AU | |
| Azure · Australia East | NOT IN AU | GLOBAL | |
| Google Vertex AI · Sydney | GLOBAL | NOT OFFERED | |
The same jobs, in Australian dollars.
List prices at the snapshot’s RBA rate, excluding GST and reasoning tokens.
| JOB | CLAUDE FABLE 5.1 | GPT-6 ASTRA | MEDIAN MODEL |
|---|---|---|---|
| Customer support replyPER 1,000 REPLIES | A$49.14 | A$49.14 | ≈ A$6.58 |
| Summarise a 30-page documentPER 100 DOCUMENTS | A$33.69 | A$33.69 | ≈ A$4.74 |
| Agentic coding taskPER 10 TASKS | A$26.67 | A$26.67 | ≈ A$3.72 |
Claude Fable 5.1 or GPT-6 Astra?
Is Claude Fable 5.1 better than GPT-6 Astra?
On our overall leaderboard Claude Fable 5.1 ranks 3rd and GPT-6 Astra 7th of 51. Which is better depends on the job: the table above compares each benchmark, price and Australian availability.
Which is cheaper, Claude Fable 5.1 or GPT-6 Astra?
Claude Fable 5.1, at A$28.08 per million tokens (blended) against A$28.08 for GPT-6 Astra. Reasoning-heavy settings add output tokens, so real bills depend on the effort level you run.
Can I use Claude Fable 5.1 and GPT-6 Astra in Australia?
Both can be used from Australia through their makers’ own APIs (Anthropic and OpenAI), which may process requests outside Australia. Claude Fable 5.1 can be called from AWS Bedrock in Sydney and Melbourne and Google Vertex AI in Sydney, but only through global routing, so requests may be processed outside Australia. GPT-6 Astra can be called from AWS Bedrock in Sydney and Microsoft Azure in Australia East, but only through global routing, so requests may be processed outside Australia.
Ratings: LMArena leaderboard dataset (CC BY 4.0), rescaled for the lens scores · leaderboards to 22 Sep 2026
Evaluations, prices and speed: Artificial Analysis (artificialanalysis.ai) · fetched 23 Sep 2026
Exchange rate: Reserve Bank of Australia, table F11.1 · A$1 = US$0.7123 on 22 Sep 2026 · prices exclude GST
Snapshot 23 Sep 2026 · updated weekly · How the rankings work →